26. The number of times a screen image is redrawn per second is the:
- resolution
- dot pitch
- dpi
- refresh rate
Answer: D) refresh rate
Explanation: Measured in hertz (Hz).
MCQs / Computer Science / Input and Output Devices
Input and Output Devices MCQs — Computer Science (page 2)
48 multiple-choice questions on Input and Output Devices from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
27. OMR is used to read:
- barcodes on products
- handwriting in letters only
- magnetic ink on cheques
- marks on MCQ answer sheets
Answer: D) marks on MCQ answer sheets
Explanation: OMR = Optical Mark Reader/Recognition.
28. An LED monitor is actually an LCD panel with:
- gas plasma cells
- no display
- an electron gun
- LED backlighting
Answer: D) LED backlighting
Explanation: LEDs light the LCD panel.
29. Which display technology emits its own light and needs no backlight?
- OLED
- CRT backlight
- Plasma backlight
- LCD
Answer: A) OLED
Explanation: Organic LEDs produce light themselves.
30. Keys F1 to F12 are called:
- numeric keys
- function keys
- cursor keys
- modifier keys
Answer: B) function keys
Explanation: They perform special functions, e.g. F1 for Help.
31. A printer that prints one complete line at a time is a:
- line printer
- 3-D printer
- character printer
- thermal printer
Answer: A) line printer
Explanation: Line printers are fast, used with mainframes.
32. Which output device is best for printing large engineering drawings and maps?
- Dot-matrix printer
- Plotter
- Thermal printer
- Speaker
Answer: B) Plotter
Explanation: Plotters produce large, precise drawings.
33. Printers that strike an inked ribbon against paper are called:
- thermal printers
- non-impact printers
- impact printers
- laser printers
Answer: C) impact printers
Explanation: Impact printers physically hit the ribbon.
34. OCR stands for:
- Online Character Reading
- Optical Character Recognition
- Output Character Recognition
- Optical Code Reader
Answer: B) Optical Character Recognition
Explanation: OCR recognises text characters in images.
35. A trackball can be described as:
- an upside-down mouse
- a type of scanner
- a type of printer
- a storage device
Answer: A) an upside-down mouse
Explanation: The user rolls the ball instead of moving the device.
36. Which printer uses toner powder and a drum?
- Inkjet printer
- Daisy-wheel printer
- Dot-matrix printer
- Laser printer
Answer: D) Laser printer
Explanation: Laser printers fuse toner on paper with heat.
37. A daisy-wheel printer cannot print:
- letters
- numbers
- graphics
- punctuation
Answer: C) graphics
Explanation: It only has fixed characters on its wheel.
38. Screen resolution refers to:
- the weight of the monitor
- the speed of the CPU
- the number of pixels displayed (width × height)
- the colour of the case
Answer: C) the number of pixels displayed (width × height)
Explanation: E.g. 1920 × 1080 pixels.
39. MICR technology is mainly used in:
- hospitals for X-rays
- shops for barcodes
- schools for attendance
- banks for reading cheques
Answer: D) banks for reading cheques
Explanation: MICR reads magnetic-ink characters on cheques.
40. A joystick is mainly used for:
- printing photos
- playing games and simulators
- scanning barcodes
- reading cheques
Answer: B) playing games and simulators
Explanation: It controls movement in games, flight simulators and machines.
41. Non-impact printers are generally:
- noisy and low quality
- only black and white
- unable to print graphics
- quiet and high quality
Answer: D) quiet and high quality
Explanation: They do not strike the paper.
42. Which is an impact printer?
- Thermal printer
- Inkjet printer
- Laser printer
- Dot-matrix printer
Answer: D) Dot-matrix printer
Explanation: Dot-matrix pins strike the ribbon.
43. A device that converts paper documents and photos into digital images is a:
- plotter
- scanner
- projector
- printer
Answer: B) scanner
Explanation: Scanners digitise printed material.
44. CRT stands for:
- Central Raster Terminal
- Colour Ray Technology
- Cathode Ray Tube
- Computer Resolution Tube
Answer: C) Cathode Ray Tube
Explanation: CRT monitors use an electron gun and a phosphor screen.
45. Monitor screen size is measured:
- by weight
- horizontally in centimetres
- vertically in pixels
- diagonally in inches
Answer: D) diagonally in inches
Explanation: A 24-inch monitor is 24 inches corner to corner.
46. Which printer can print carbon copies (multi-part forms)?
- Thermal
- Laser
- Dot-matrix
- Inkjet
Answer: C) Dot-matrix
Explanation: Only impact printers can press through carbon copies.
47. Printer resolution is measured in:
- MB
- Hz
- dpi (dots per inch)
- rpm
Answer: C) dpi (dots per inch)
Explanation: Higher dpi gives sharper prints.
48. The touch-sensitive pad used in laptops instead of a mouse is a:
- digitizer drum
- trackball
- joystick
- touchpad
Answer: D) touchpad
Explanation: Also called a trackpad.
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Practise Input and Output Devices MCQs
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